Method and device for diagnosing a component in a gas-routing system of an engine system having a combustion engine

Abstract

A method for diagnosing a component in a gas-routing system of a supercharged combustion engine having an electrically operable compressor, the method including activating the electrically operable compressor after the combustion engine has been shut off, opening a flow path through the gas-routing system, measuring a state variable in the gas-routing system, and detecting a fault of the component as a function of the measured state variable.

Description

CROSS REFERENCE[0001]The present application claims the benefit under 35 U.S.C. § 119 of German Patent Application No. DE 102015221786.8 filed on Nov. 6, 2015, which is expressly incorporated herein by reference in its entirety.FIELD[0002]The present invention relates to supercharged combustion engines having electrically operable compressors. In particular, the present invention relates to methods for operating electrically operable compressors in supercharged combustion engines for the diagnosis of components in a gas-routing system of an engine system having a combustion engine.BACKGROUND INFORMATION[0003]In the course of downsizing supercharged combustion engines, the effect of the dynamic run-up delay of supercharger devices is intensified in a torque demand, the so-called turbo lag. One possible measure therefore consists of using electrically operable compressors instead of exhaust-gas-driven supercharger devices, or it consists of providing exhaust-gas-driven supercharger de...

AI Technical Summary

Benefits of technology

[0013]These diagnosis methods frequently require operating states in which the emissions of the combustion engine worsen. However, the objective is to perform the diagnoses without interfering in the operation of the combustion engine to any significant degree or without worsening the exhaust-gas emissions.

[0020]According to a further specific embodiment, the electrically operable compressor may be activated to provide a temporal sequence of at least two different predefined powers, the fault of the component being detected if the change in the values of the state variables measured at the different powers deviates by more than a predefined tolerance amount from a specification, which is determined in particular with the aid of the change in the predefined power and possibly as a function of an operating point of the combustion engine. By sequentially actuating the electrically operable compressor at different predefined powers, it is possible to achieve correspondingly different defined gas flows in the gas-routing system, which in the fault-free case, lead to a specific change in the values of the state variable indicated by the specification.

Problems solved by technology

These diagnosis methods frequently require operating states in which the emissions of the combustion engine worsen.

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